天津地区夏玉米施钾效果的初步研究

Study on Effect of Potash Fertilizer Application in Farmland of Tianjin District

在天津砂壤质潮土上进行了夏玉米施钾效果的试验研究。在施 N 1 87.5kg/hm2 和P2 O5 75kg/hm2 基础上 ,设计了 4个施钾 ( K2 O)处理 ,即 0、37.5、75、1 1 2 .5kg/hm2 。试验结果表明 :随着施钾量增加 ,玉米生长和抗逆性增加 ,果穗增长 ,秃尖减少 ,产量提高。但高钾处理增产幅度变缓 ,其中 75kg/hm2 的施钾处理 (即 N:P2 O5 :K2 O=1 :0 .4 :0 .4 )

Experiment research on effect of applying potash fertilizer to summer corn was carried out in Tianjin fluvo aquic soil(chao soil) of sandy loam.Based on applying N 187.5 kg/hm 2 and P 2O 5 75 kg/hm 2,four potash fertilizer application treatments,i.e.0,37.5,75,112.5 kg/hm 2 were designed.The results showed that the growth and adverse circumstance resistance of summer corn improved ,fruit cluster became longer,its bald tip became shorter and the yield also improved.But,with the high potash treatment,the yield increment became slower.Among them,the treatment of potash fertilizer 75 kg/hm 2(i.e.N:P 2O 5:K 2O=1:0.4:0.4)was more reasonable.